Frank,
If you left your CNBG is the forage pond, it will be interesting to see how many die-off. I bet it's less than you think. I'm even willing to guess way less than you think.
I agree there is certain things we can count on, but with the variety of our ponds, the answer is going to be " It Depends".
From your mouth to God's ear, Brian. I'm not optimistic, but until I can get down to the forage pond there's no way to know for sure. At least I didn't see any vultures, which I definitely did see the last time we had a fish kill.